1 Answer
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On my Sony Vaio VPCEG15FB on Ubuntu 14.04 when I use two fingers spaced on touchpad (to up or down) I have the following results:

On firefox:
Scrolling

On Shotwell
Zoom

File (Explorer)
Scrolling

On https://wiki.ubuntu.com/Multitouch/TouchpadSupport say:
"Unfortunately, X can't send touch events if it is also sending other events caused by the same touches. For example, if you have two finger scrolling enabled for a touchpad, X can't send touch events until you put three touches down."